On the Sutherland's Integrability Condition for Two-Dimensional N-Particle Systems

Following Sutherland's work on one-dimensional integrable systems we formulate and study its two-dimensional version. Physically it expresses the absence of true 3-body forces among an assembly of N particles leaving exclusively effective 2-body interactions. This criterion may be a suitable candidate for an integrability condition.Comment: 13 pages,uses LATeX2e and epsf. File prepared using the uufiles packag

Quantum properties of spherical semiconductor quantum dots

Quantum effects at the nanometric level have been observed in many confined structures, and particularly in semiconductor quantum dots (QDs). In this work, we propose a theoretical improvement of the so-called effective mass approximation with the introduction of an effective pseudo-potential. This advantageously allows analytic calculations to a large extent, and leads to a better agreement with experimental data. We have obtained, as a function of the QD radius, in precise domains of validity, the QD ground state energy, its Stark and Lamb shifts. An observable Lamb shift is notably predicted for judiciously chosen semiconductor and radius. Despite the intrinsic non-degeneracy of the QD energy spectrum, we propose a Gedankenexperiment based on the use of the Casimir effect to test its observability. Finally, the effect of an electromagnetic cavity on semiconductor QDs is also considered, and its Purcell factor evaluated. This last result raises the possibility of having a QD-LASER emitting in the range of visible light

Human trafficking and organised crime

international economy;illegal immigration;international migration;organized crime

Human Security and the Governmentality of Neo-Liberal Mobility: A Feminist Perspective

Transnational migration and its implications for human security as a policy field constitute one of the most complex issues of our time. Current experiences of displacement and security spans between a cyber world characterized by hyper mobility of finance, technology, information and the ‘cosmopolitan’ values of a ‘flexible citizenship’ (Ong, 1999) to the world of human trafficking and smuggling of migrants and refugees as a mode of mobility adopted by people who cross borders on foot, by boat, trucks and planes who are often abandoned to die when arrangements break down (Eschbach/Hagan/Rodriguez, 2001; El-Cherkeh/Hella, 2004). The extant legal vacuum reflects unresolved conflicts of interest at different levels and poses a great challenge to the right to mobility as an expression of the liberal ideal of individual liberty.feminist perspective;human security;neo-liberal mobility

Liberalisation, care and the struggle for women's social citizenship in Vietnam

social policy;subsidies;Viet Nam;economic liberalization;care work;women workers;women's rights

Gender and enterprise development in Vietnam under Doi-Moi : issues for policy, research and training

Viet Nam;economic development;gender equality;small enterprises;women entrepreneurs